Question 1

Which of the following best describes the primary function of the cardiovascular system in vertebrates?

Accepted Answer

To transport nutrients, gases, and wastes throughout the body

Question 2

Sponges and cnidarians lack a true vascular system. How do they primarily exchange gases and nutrients with their environment?

Accepted Answer

By diffusion across their body surfaces and gastrovascular cavity

Question 3

Hemoglobin is crucial for vertebrate physiology. Where is hemoglobin found, and what is its primary function?

Accepted Answer

In red blood cells; it binds and transports oxygen

Question 4

Write the carbonic acid equation and explain its physiological importance in vertebrates.

Accepted Answer

$$\mathrm{CO_2$ + H_2O \leftrightarrow H_2CO_3 \leftrightarrow $$HCO_3$$^- + H^+}$$; it helps maintain blood pH and transports CO$$_2 in $$the blood

Question 5

Which body systems utilize the carbonic acid equation for maintaining homeostasis?

Accepted Answer

Respiratory and circulatory systems

Question 6

Which of the following correctly matches the three major anatomical components of most animal cardiovascular systems with their general functions?

Accepted Answer

Heart: pumps blood; Blood vessels: transport blood; Blood: carries gases, nutrients, and wastes

Question 7

Which of the following is a key difference between open and closed circulatory systems?

Accepted Answer

Closed systems allow for higher blood pressure and more efficient nutrient delivery than open systems

Question 8

Which organism is most likely to have a single circulatory system, and what is a characteristic of this system?

Accepted Answer

Fish; blood passes through the heart once per circuit

Question 9

Which of the following best describes the flow of blood through the major structures of the mammalian heart?

Accepted Answer

Right atrium → right ventricle → pulmonary artery → lungs → left atrium → left ventricle → aorta

Question 10

Which statement correctly defines blood pressure and its two main components?

Accepted Answer

Blood pressure is the force exerted by blood on vessel walls; systolic pressure is during heart contraction, diastolic pressure is during heart relaxation

Question 11

A patient has a blood pressure reading of 140/90 mmHg. What do the numbers 140 and 90 represent?

Accepted Answer

140 is systolic pressure (ventricular contraction); 90 is diastolic pressure (ventricular relaxation)

Question 12

Which of the following best describes how blood flow and pressure change as blood moves from the aorta to the vena cava?

Accepted Answer

Blood pressure and velocity decrease, and total cross-sectional area increases

Question 13

Which of the following is a correct description of vasoconstriction?

Accepted Answer

Narrowing of blood vessels, which increases blood pressure

Question 14

A person experiences a sudden drop in blood pressure after standing up quickly. Which physiological response would help restore normal blood pressure?

Accepted Answer

Vasoconstriction of arterioles

Question 15

Which of the following best explains why closed circulatory systems are advantageous for larger, more active animals?

Accepted Answer

They allow for higher pressure and more efficient delivery of oxygen and nutrients to tissues

Question 16

Which of the following is NOT a function of white blood cells?

Accepted Answer

Transporting oxygen

Question 17

Which vessel type is primarily responsible for the exchange of gases, nutrients, and wastes between blood and tissues?

Accepted Answer

Capillaries

Question 18

Which of the following best describes the role of hematopoietic stem cells?

Accepted Answer

They give rise to all types of blood cells

Question 19

A mutation causes hemoglobin to bind oxygen less efficiently. Which body system would be most directly affected, and what would be a likely symptom?

Accepted Answer

Respiratory system; fatigue due to reduced oxygen delivery

Circulation and Gas Exchange: The Cardiovascular System

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